(And yes, there are kettles designed to plug into a 12-volt outlet, like the Roadpro 12V Hot Pot.)

Zero volts required - My hand coffee mill, AeroPress and coffee mug.

The Aeropress is particularly well suited to travel because it is made from a high impact plastic is pretty much indestructible.

While the 12-volt plugin brewer is still a favorite among RV users, there is a growing interest is different kinds of coffee makers for anyone "on the go". This interest is probably fueled by the very poor quality of coffee brewer found in most hotel rooms.

Hence the growing interest in the Aeropress and press pots that are tough enough to travel, like the Espro.

If you need a brewer that plugs into a vehicle, go for the 12-volt option. If you simply want a brewer that will travel, there are plenty of other options to explore.

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The Espro, mentioned above, is a rugged, stainless steel press pot, well-suited to travel and life on the road.